Results 271 to 280 of about 228,732 (306)

The ‘Indian rope trick’ for a parametrically excited flexible rod: linearized analysis

Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2000
Extract from authors' abstract: It is well known that if a column exceeds a certain critical length it will, when placed upright, buckle under its own weight. Recent experiments demonstrate that a column that is longer than its critical length can be stabilized by subjecting its bottom support point to a vertical vibration of appropriate amplitude and ...
Champneys, AR, Fraser, WB
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Design of Viscous Dampers in Seismically Excited Flexible Truss Towers

Journal of Earthquake Engineering, 2013
In the present article, the gain matrix for active devices placed directly between masses on a truss tower is transformed for devices placed at multiple levels between masses. The transformed gains are then used with the single-mode approach to determine the damper coefficients.
K. K. Walsh, S. Kalyanam, M. D. Rambo-Roddenberry   +2 more
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Mechanical model for cylindrical flexible concrete tanks undergoing lateral excitation

Soil Dynamics and Earthquake Engineering, 2018
Abstract In this paper, a mechanical model is developed for evaluating the seismic response of flexible concrete cylindrical tanks under horizontal ground motion. For obtaining the parameters of the liquid-shell interaction of this model, a semi-analytical approach is employed using the Rayleigh–Ritz method.
R. Moradi, F. Behnamfar, S. Hashemi
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Control synthesis for flexible space structures excited by persistent disturbances

Journal of Guidance, Control, and Dynamics, 1992
Summary: Both classical and state-space synthesis methods for active control of flexible space structures in the presence of persistent disturbances are presented. The methods exploit the so-called internal model principle for asymptotic disturbance rejection.
Wie, Bong, Gonzalez, Marcelo
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Stability and Control of Flexible Spacecraft with Parametric Excitation

IFAC Proceedings Volumes, 1978
Abstract The analysis and control of flexible spacecraft has attracted considerable attention in recent years; in particular with ever increasing demands for fine pointing accuracy and larger and more complex vehicles, this problem is becoming more significant.
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Parametric resonance of flexible footbridges under crowd-induced lateral excitation

Journal of Sound and Vibration, 2008
Abstract The excessive lateral sway motion caused by crowds walking across footbridges has attracted great public attention in the past few years. Three possible mechanisms responsible for such lateral vibrations have been investigated in the literature: direct resonance, dynamic interaction, and internal resonance.
PICCARDO, GIUSEPPE, TUBINO, FEDERICA
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Stochastic response of flexible rotor-bearing system to seismic excitations

Probabilistic Engineering Mechanics, 1986
Abstract Random vibration analysis of flexible rotor-bearing systems subjected to six-component nonstationary earthquake ground accelerations is carried out. The rotor system consists of several rigid disks and a flexible shaft that is modelled as a Timoshenko beam.
Ki Bong Kim, Jann N. Yang, Y.K. Lin
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Microwave re-excitation of femtosecond laser tagging for highly flexible velocimetry

Optics Letters
Molecular tagging velocimetry is typically species specific and limited by excited state/species lifetimes. We utilize laser-generated ionization, long-lived anions, and a time-delayed microwave pulse to monitor the tagged region up to several milliseconds.
Fynn Reinbacher, Sarang Bidwai, James B. Michael   +2 more
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Response of a flexible marine column to base excitation

1984
The displacement response of a flexible, surface-piercing cylinder subjected to a unidirectional base motion is considered in this study. Laboratory experiments have been performed with a circular, fixed-base model using sinusoidal and scaled seismic input motion.
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1121 Self-Excited Flapping Mechanism of Flexible Wings

The Proceedings of the Symposium on the Motion and Vibration Control, 2007
Hiroshi NAKAI, Masahiro WATANABE, Hideaki TANAKA   +2 more
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